Discharge device



July 4, 1939. F. H. A. BRANDT DISCHARGE' DEVICE Filed oct. 2e, 1931IF 4 sheets-sheet 1 INVENTOR July 4, 1939. F. H. A. BRANDT 2,164,307

DISCHARGE DEVICE Filed Oct. 26. 195'? 4 Sheets-Sheet 2 I N V E N TO R fanfare/cu AM. len/vw' July 4, 1939.l

F. H. A. BRANDT DISCHARGE DEVICE Filed Oct. 26. 193'? 4 sheets-sheets INVENTOR July 4, 1939.

F.` H. A. BRANDT DISCHARGE DEVICE Filed 0st. 26, 1937 4 Sheets-Sheet 4 lNvEN'roR femore/cli //LBP ar Patented July 4, 1939 UNITED STATES PATENT Y OFFICEI .DISCHARGE DEVICE Friedmann. A. Brandt, New York, N. 1r.y Application October 26, 1937, Serial No. 171,050

"12 claims; (ci. 17e- 122) This 4invention relates to a gaseous electrical discharge device; moreparticularly to a device of the type in which the envelope in which the discharge occurs is enclosed within a protective 5 jacket. l j

Prior to .my invention it has become customary, particularly in high temperature discharge lamps.' e. g., the. high intensity high pressure mercury arc lamps which have recently come l0 into wide commercial use. to mount the discharge envelope upon a frame within a protective jacket. It has been common practice to manufacture this protective jacket substantially according to the methods and practice established in the manufacture of incandescent lamps vsupporting the vframe by means of wires sealed into a pressed seal in substantially the same way that the 1avment support wires of yincandescent lamps are mounted. Such a construction is expensive and its usefulness is terminated when the inner lamp is damaged or burned out.

It is an object of my present inventionto pro- I vide a jacket and mounting for such discharge devices which will be simpler and less expensive than themountings now in common use.

Another object of my invention is to provide a mounting capable of quick and easy removal from the jacket, whereby a burnt out or damaged discharge tube can be quickly replaced without the necessity of replacing the jacket and mounting.

Another object of the invention is to improve the thermal and electrical conditions to which the discharge tubeis subjected during starting and operation.

With these objects in view my present invention contemplates the use of an open ended jacket with a connector base over the open end of the jacket and removable clamping means for securing the base on the jacket which means is releasable from the outside 'of the jaacket so that the assembly can be locked'together when assembled or released for replacement of a discharge tube and advantageously there is provided also a frame for supporting the discharge tube within the jacket which-is adapted to be releasably assembled with the jacket so that it can be inserted into and removed vfrom the jacket as a unit and which, moreover, maywith advantage 5g be connected to or mounted upon a part of the base or the clamping means so as to be held positioned Within the envelope when the base is clamped on the end of the jacket.`

In the accompanying drawings I have shown 55 several preferred embodiments of my invention and various modincationsthereof. It is to be understood that these are not intended torbe exhaustive or limiting of the invention but `on the contrary are chosen with a .view to instructing othersskilled inthe art so full as to the princi- 5 ples of the invention and the best manner of embodying it in practice that others will be readily able to adopt it and modify it and-to embody it in numerous other forms each as maybe best suited to the requirements of a particular use. l0 In these drawings: .i Y Fig. 1 is a view in vertical sectionof a high pressure mercury vapor lamp embodying my in- 1 vention; i n Figs. 2, 3 and 4 are views in transverse `section/15 taken respectively on lines 21,-!13-1-3 y,and 4-4 ofFig.1;V Fig. 5 is a view partly in axial section and partly a phantom elevation showing another preferred embodiment of my invention; q Figs. 6 and 7 are sectional views similar respectively to those of Figs. 2 and 4 but showing the modified form of Fig. 5;

Fig. 8 is a view similar to Fig. 2` but showing another embodiment ofthe invention; q 25 Figs. 9 and 10 aretransverse sectional views taken on lines 9-9 and I ll-IIJ of Figc-8; y

Fig, 11 is a. fragmentary view corresponding to the lower end of Fig. 8 but illustrating a modiiication thereof; y 3 Fig. 12 is a sectional view similar to Fig. 1 but showing another embodiment of theinvention; Y, Figs. 13 and 14 are transverse sections taken on lines |3-I3 and Il-II respectively of Fig. 12; 35 and Figs. 15 and 16 respectively are sectional views similar to Fig. 1 showing other embodiments of v the invention. 5 y

Referring first to Figs. 1 to 4, the lamp there `0 shown comprises an `inner discharge tube 20 which comprises a sealed envelope of refractory glass or quartz or vother suitable material with the electrode lead-in wires 2I sealed through the ends thereof and each having an actlvatedself-n 45 heating arcing electrode secured thereon. These electrodes may, for example, be of va type described and claimed in av copending application of Hans J. Spanner, Serial No. 130.872filed March 15, 1937, or in the Patent No. 2,073,885, dated March 16, 1937. Within the envelope is a filling adapted to provide a gaseous atmosphere for the discharge. In the case of the high pressure mercury vapor arc the lling will advantageously be argon at a pressure in a range about 14 mm. and 55 l "um @which consists or the longitudinal wires :s and thetransversemembers imple. as' best-museum in 'serve as spring-ungers to tion Slain the wall 2,194,801 :.an`amount of mercury measuredto provide when discharge tube is mounted una frame and 21 and a clamping This frame constitutes a loop longithe discharge tube 2l. The

in this preferred ex- Fig. 3, formed of a pair o! nickel ribbons, spot welded at the points ll and 8| and having the extensions I2 which engage the inner wall tube 2l Dit 28.

transverse member 21 is,`

of the jacket Il and hold the discharge resiliently positioned within the jacket.

I 'he outer transverse member 2l in the preierred example as most clearly shown in Fig. 2 is also formed oi a pair oi nickel ribbons similarly spot welded at the'points Il and Il'. In this case, however, instead o! being welded dircctly to the longitudinal wires 2i Vthey are welded .to clamping blocks 80. 'Riese blocks, as clearly shown. are drilled for the reception oi' the wires l! and are slidable on them, being held rigidly in position by means o! the set screws I1. In addition to this theblock 3 8' has an elliptical slot insteadoi oneiittedtothewire; andbeddc thewirethrwshthisdctlsmsertedtneensor the with mation 2,8, w that. when et l1 is the connection Il 'ls clamped against the wire!! and electrical connection is thus made between the outer electrode and the trame. The frame may be wholly or partly made oi materials other ,than nickel; but, of course, should be suiiiciently refractory so that it is n ot sottened, corroded or otherwise damaged by the heat to which it is subjected or` the air towhichitisexposedwithin theicket In assembling the frame and discharge tube, the tubeisnrstinserteiitliroushtheinnertrans, verse member 21, andthe outer transverse member 2l is'then slippedover the ends of the dis#-V charge tube and the ends o! the wires 2l. The free end of the flexible connection!! is inserted intothe opening in the block I6' and, withthe transverse member 2l pushed down iirmly against the top of the tube, the set screws l1 are driven tightly into position to hold the transverse member securely on the members 2l.

This assembly together with the clamping plate 2l which is secured to the bottom of the wires 2l is then inserted longitudinally into the 'Jacket u unul the plate u is above me projecotrthe tube. Dllring the insertion the plate Il readily passes the projections 3l by reason of the larger notches 39. Once the plate Il is inserted beyond the projections 38 it is then turned so as tobring the smaller notches into alignment with the projections. The end o! the nexible connection Il is pulled out throughanopening inthcplate lll andan insulatingtube 2S is slipped over it to insulate it from the plate Il.' The end is then turned over the edge oi' the iacketllwhereitwillbecontactedbytheiiarcd 'tube skirtlloitheconnectorbosellandwillbe clamped between it and the jacket Finally the female screw I6' inserted through the-center ot the connector base 44 is screwed 'intotheboltliintheresilientmetalplate28 thusdrawingtheplatetightiyagainsttheprojections 3l and on the other hand drawing the connector base tightly against the open end of the jacket 35. Thus the entire assembly is held clamped securely in assembled relation as shown.

Whenitisdesiredtoreplace thetubeitisonly necessary to remove the lamp from the socket. unscrewthescrew ,turntheplate toalign the ,larger notches I! with the projections 38, remove tiie tube and frame assembly from the jacket. release the set screws I1, remove the transverse member 2i, remove the tube 2l from the frame and repeat'the assembly as just described above, using. of course,V a replacement The constructionshowninli'igs. to'iissimilar to that described aboveV except that instead of usingaskirtllmthebasellaseparate insulating ring Ila is used with a standard mogul screwbase lla. Again, instead of using the nickel-ribbon cross members 221, I have used in this case sheet nickel stampings consisting of iiat rings 26a and 21a with ngers 32a bent up and down to give resilient contact with the jacket 35 and the frame members 25a. At the inner end of the envelope the member 21a is ilxed in the frame by welding at lia to the frame members Ila. 'Ihe outer cross member 21, however, is slidably mounted on the members 25a and is clamped against the end oi' the envelope by the nuts 81a. The connection 2l is likewise clamped in cmtact with the frame by winding it under one or the nuts 31o before the latter is screwed down against the cross member 21a.

Inthe embodimentoil'lgsto'ilhaveused only three projections lla and corresponding notches 3Q and Il. This is an advantage both because it removes less metal from-the washer 2.a and because it produces better centering and less strain on the projections 38a.

The disk Ilo is provided with a rounded projectlon at the central threaded opening. 'Ihis gives the disk greater rigidity and tends to make it more secure on the threads of the bolt 45.

In Figs. 8, 9 and 10 I have shown another embodiment oi' my invention. The structure shown in these iigures is substantially similar to that shown in Figs. 1 to 7, and I have indicated corresponding parts by corresponding reference characters. In this case, however, instead of having the dents Il at the end of the jacket 35, I have positioned the dents "b a substantial distance from the end and the locking disk 2lb is provided with a central opening suiiiciently large to receive the seals for the lead-in wires and any other projections, as for example, the pumping tip Il and the seal Il for an auxiliary starting electrode, both on the end of the envelope.

Where an auxiliary electrode is sealed through Vthis end oi the tube and a pumping tip is left tothestrengthotthediskltbutprovidesa'ls provided a nickel cap 23b'substantialiy iitted `to.

end welded to the electrode lead-wire 2|.

niort-.nor

rounded surface oi contact with the projections 38h, thereby reducing any tendency to crush the threaded. as indicated at 45h to form a clamp-'- ing bolt which is engaged by the female screw 46. A stranded wire conductor .24 welded tothe outer end of the lead-in wire 2i is brought over the edge of the washer 42 where it is engaged by and makes electrical contact with the connector base u. A glass tube 29 insulates the connecting wire 24 from the frameV and other electrical parts.

At the lower end of the envelope 30h there is the shape oi the envelope and having its lower This cap 23h. therefore, serves to conduct-.the electrical current from the loop 2lb of the frame which is pressed against it to the lead-in wire 2| and through it to the electrodes within the lamp.

This embodiment of my inventionis very simple and rugged in use. When the lamp is assembled, the disk 28h lis pulled upward in the loop along the side members of the\ frame h until the distance 4between it and the loop 2lb is at least equal to the distance between the base of the seal at the-lower end of the envelope 30h and the tip of the electrode in-lead 2i at the upper end' of the envelope. The envelope `is then inserted by titting the lower seal through'the loop 2lb with its cap 23h against the loop 2lb. The envelope is then swung into parallel position between the side members 25h and the disk 28h is pressed down over the end of the envelope until it is in a clamping position.

The friction Voi.' the side members of the frame 25h in the holes in which they pass through the disk 28h is suiiicient to hold the parts in this assembled relationship. The assembly is then inserted into the jacket h with the notches 39h aligned with the projections 38h on the side of the jacket. As soon as the disc 28h is beyond the projections 38h, the assembly may be rotated sufiiciently to align the projections 38h with the smaller notches 40h. The insulating washer 42 is then put in position and the connecting wire 24 is drawn over its edge; the connector base M is tted onto the neck of theA washer 42; and nally the female screw 46 is inserted through thecenter of the base 44 and engaged with the threaded end 45h of the frame and screwed thereon until the parts are all securelyclamped together.

t is an advantage of this construction that the nickel cap 23h serves not only as an electrical conductor but also as a thermal reiiector at the lower end of the envelope, which otherwise tends to be the coolest portion of the envelope and in which the condensed mercury would tend topo/client. Thus this cap serves to improve the operation of the lamp by hastening the heating up and avoiding excessive cooling at this lowest point during operation. Also the contact between this cap and the metal frame 21h serves to heat the end of the envelope by conduction from the adjacent the arc path. Likewise, after the lamp isontinettithed the therniai contact be#4 tween the nichel cap and the frame serves to dissipate heat from the end, and thereby-to hasten the condensation oi' mercury which is necessary for restarting when, for anyieason, the lamp is temporarily extinguished.

The dish 2th likewise serves an important function during the operation of the lamp in that it constitutes a convection barrier. Without such a barrier Vthe convection currents tend to iiow upward along the envelope 30h cooling the bottom of the envelope and heating'the top and, especially when the lamp is burned in the baseup position as shown, such convection currents tend to overheat the connector base. The disk 28h, as shown in Fig. 8, .presents a barrier toV l these convection currents deiiecting them lfrom the upper end of the envelope outward against the jacket where they'are cooled and returned to'the bottom of the lamp. The draft in the .jacket is thus divided, and thus, both the cooling of the bottom of the lamp and the overheating of the seal for the .electrode in-lead and of the vThe otherband 51 holds the resistor mechanically on the frame but is electrically insulated. At the opposite end ofthe resistor a band is provided with a` set screw 58 and 'a suiiicient clearance to allow the stranded conductor 5l to be clamped between it and the set screw 58. The n opposite end of this stranded conductor 59 is welded to the in-lead 5I for the auxiliary electrode. Thus a connection is made between the auxiliary electrode and the. center contact of the connector base through the frame 25h. the band 56, the resistor 55, the connector 58, the stranded conductor 58 and the in-lead 5I.

In Figli, I have shown a modification oi the construction shown in Figs. 8-10,` in which, in-

stead of the nickel cap 23h, a stranded conductor' 23 is welded to the lower in-lead 2i and this conductor wire is wrapped around the shoulder 32o so as to be clamped against the frame bythe pressure of the shoulder 32h against the insidefoi the jacket 35D.v

In Figs. 12, i3 and 14 there is shown another convenient` construction. In this case the frame 25e' is made of a single looped wire. The lower end of this frame, as shown, may be made with a closed loop similar to that shown at 2lb in` Fig.4 i0, or with a, re-entrant or` U-shaped loop preferably with the adjacent ends of the U pushed together to iorm a substantially closed'loop like that used at the top of this frame. Near this loop the frame is formed with shoulders 32h substantially similar to those shown in Figs. 8 and l0. The side members 25o are preferably close to the envelope, as shown, and near the upper end of the envelope the frame extends outwardly again to form shoulders similar tothe shoulders 32h which contact with Vthe sides ofthe jacket 35h. 'Ihe wire of the trame then .turns inwardly from these shouldersEU each side forming, as most clearly shown in Fig. 13, a part oi a loop 26e which engages the upper end of the envelope.

The ends oi' the wires then extend in a loop 28e, as clearly shown in Fig. 12, terminating in the weld 53e with a nut 46c welded between the ends, engages the clamping bolt' lic.

The Jacket 35e is formed with grooved shelves 38e instead of the projections as in the other embodiments discussed above. The grooves in these shelves are adapted to engage the sides of the looped upper end of the frame to hold it both against twisting in the jacket away from the shelves 38e and against pulling longitudinally out from the jacket 35e. By reason of the concave form ofy .the loop 28e, the pull on the nut 46o exerted by the bolt 45o serves to expand the looped end of the frame against the grooved shelves 38e, and this prevents the frame from collapsing and pulling over these shelves. This arrangement provides a substantial mechanical advantage against the glass, and it is important that this should not be allowed to be so great as to cause breakage of the jacket when the parts are assembled.

In the use of this 'embodiment of the invention the envelope is i'irst inserted through the loop 21e in the same manner as already described in connection with Fig. 8. -The upper end of the frame is then pressed so as to open the loop 26e to allow the upper electrode seal to pass into the loop. The frame is made so that when relaxed the spacing between the loops 28e and. 2lb is slightly less than the length of the envelope so that when the envelope is slipped into position the frame is slightly sprung and the envelope held resiiiently in position. The stranded conductor 23 is then wrapped around the shoulder 32b,'as already described inconnection with Fig. 11, and the assembly is inserted into the jacket 85e with Athe shoulders rIl and the upper looped portion 28e voithe trame at an angle tothe shelves "c so that they pass readily linto the envelope. When this loop llc is beyond the shelves 38e, the assembly is yrotated to bring `the loop c of the trame into alignment with the grooves in the shelves c and thereby the frame is locked into the jacket 35e.

The insulating washer I2 is next put into position and the end of, the stranded wire 24 is folded over its edge, and finally the connector base IlA is put into position and the entire assembly clamped together by means of the bolt lic.

It is an advantage of this construction that, once the frame is inserted into the Jacket, the loop 26e is locked in its closed position and thereby the envelope 3l is held securely in the frame, whereas, as soon as the frame is removed from the jacket and the shoulders 60 are thereby released the frame can be spread and the loop 26e may be opened to release the envelope Ill from the frame.

In the embodiment of the invention shown in Fig. the connector base d is provided with a wide flange 42d at the edge of which is a threaded portion 65. 'I'he jacket 35d is provided at its upper end with a threaded portion corresponding to the thread 65 on the base so that the jacket and base may be screwed together.

The. frame 25d in this case, instead of merely being clamped within the jacket is secured, e. g., by welding, to the flange 42d of the base 44d and is made so that the envelope is removably engaged within this frame.

In the case shown in Fig. 15 the frame consists of a simple looped wire 25d having at its lower end a closed loop 21d into which the end of the envelope l0 is iltted. The sides of the frame are straight and on them is tted a cross member 26d which is provided with a loop corresponding to the loop 21d and at its ends is closely wound around the sides of the frame 25d as shown at 66.

In the use of this embodiment the envelope 30 is first mounted within the frame by inserting the lower end into the loop 21d, pushing the cross member 26d along the side members 25d toward the base swinging the envelope 30 into parallel relation between the side members 25d, and then pressing the cross member 26d down over the end of the envelope into clamping relationship. By virtue of the coils 66 a secure frictional engagement may be had for holding the parts in this relationship merely by pressing the coil 66 downward beyond the position which is naturally assumed when the 'member 26d first contacts the top of the envelope. The resilient twisting of the coils 66 which results from this deformation of the member 20d gives a frlctional engagement with the frame 25d and holds the cross member against sliding upward.

l The stranded conductor 23 connected to the lower in-lead wire is, as shown, engaged between the loop 21d and the envelope and thereby holds electrical connection with the frame. The stranded conductor 2l between the upper in-lead and the center contact of thev base is drawn through a hole in the center contact and engaged under the set screw 50d. Finally the jacket d is slipped over the other parts and screwed onto the threaded portion 65 of the base.

In Fig. i6, a similar arrangement is shown in that the jacket is screwed onto the base at 85. 'I'he base and its method of connection to the stranded conductor 24 may be substantially the same as in the embodiment illustrated in Fig. 15. In this case, however, instead of a trame secured to the base, a. simple resilient spider 25e is used vto engage the upper end of the envelope, whereas the lower end ci' the envelope is held positioned in the jacket 35d by means of the helical spring 10. Since in this case there is no longitudinal frame to conduct the current from the lower electrode back to the connector base, there is provided in this case a metal ribbon 1i, which is preferably insulated from the surface of the glass, e. g., by a strip of mica beneath it or by an enamel or other insulating coating, e. g., the strip may be made of valuminum or nickel heavily oxidized to provide an insulating coating of the oxide. This strip may be held in position, e. g., by means of the circumferential wires 12 and these should advantageously be insulated either from the strip 1| or from the glass of the envelope, e. g., in the same manner that the strip 1l is insulated. The end of the strip 1| passes between the envelope and the resilient spider 25e and its outer surface at this point exposes the `bare metal whereby to form a pressed electrical connection with the spider 25e and through it with the shell oi.' the connector base Md.

In the use of this embodiment of my invention the spider 25e is fitted into the base. The stranded conductor 24 is then inserted through the opening in the. base and secured by the set screw d. The envelope 30 is iitted onto the spider 25e, and the spring 'ill onto its other end. Finally the envelope 35d is iitted over this assembly and screwedonto the base at 65.

What I claim is:

1. A lamp comprising a gaseous discharge tube, a light permeable open ended jacket adaptedto receive and protect the discharge tube and having approximately cylindrical form from the open sgieasov end to the oppositeehd oi the discharge tube, and having inwardly directed projections on its wall near the open end, a frame for supporting the discharge tu'be inthe jacket having means Y to engage the jacket for positioning the frame therein, atleast one longitudinal member, transverse members mounted on the longitudinal member and" engaging the ends of the discharge tube and movable longitudinally relative to one another lfor insertion'and removal of a discharge ltube between them and-means for holding the 4transverse members on the longitudinal member to prevent such relative movement, said frameA with the discharge tube mounted therein being i5 movable as a unit and dimensionedIor-insertioninto and removed from the open end of said jacket, a resilient diskin the Jacket having pe-V ripheral Vnotches adapted to pass the projection on the jacket and lesser notches adaptedto enzo Hage saidrprojections and lock the disk thereonagainst turning and against longitudinal removal,

an insulating collar lover the. open end of the jacket having a flange adapted to llt a connector.

base, a connector base on said flange. a boltcon-V g5 nesting the connector base to said disk to hold the connector base and through it said washer in place on the jacket, and meansl for connecting cotnacts of the connector base to' the discharge ab 2. A lamp comprising a gaseous discharge tube, f a light permeable open ended jacket adapted to I receive and protect the discharge tube and having means on its .wall to engage a frame and holdit against longitudinal withdrawal, a frame for sup u porting tnedmeherge tube in the jacket having `means to engage the jacket and means to engage the tube whereby-to position the tube-in the jacket, a connector base on the open end oi' .the `jacket. means connecting the connector base to o said jacket to hold the connector base thereon, and means for connecting contactsot the connector base to theldischarge tube.

a. A :amp as dennealn cnam 1l in .wmcn the ends of the tube are provided with iiexlble conductors one of which'is connected to the trame `by releasable clamping means, and through the frame and the connecting bolt to the center contact o! an Edison type base, and the other yconductor at the other end of the tubeis exo tended between the shell of the base and the insulating collar and is clamped therein in elec-` trical contact with Vsaid shell by the action of said bolt on said base.

4. n lamp as denned in claim 2 in which the' 55 frame is adapted to engage and hold the discharge tube and is dimensioned to nt snugly into the jacket whereby the frame and vtube may be f inserted into' and removed from the jacket as a unit and the means connecting `the connector base to the jacket is adaptedto secure the frame against longitudinal movement in the jacket.

5. Alarnp comprising a gaseous discharge tube,

a light permeable open ended jacket adapted to receive and protect the discharge tube, a frame for m supporting the discharge tube in the jacket,1an outwardly directed connector base mounted upon the open end of said jacket for connecting the lamp to a source otcurrent, means to secure said base removably on saidjacket, whereby the lamp 7o may be supported by said connector base, means adapted removably to connect the contact elements o! the connector base tothe electrodes of the dischargetube, and meansto position said frame removably in said jacket.

il. In combination with a jacket having a 'removable closure and a discharge tube therein, a frame for mounting Athe discharge tube which l comprises a substantially rigid wire-forming a" longitudinal loop along the tube and transverse' members associated with said loop adapted to em- 5 brace respectively the-ends of the tube so as to hold the tube between them, and at least one of said transverse members being movable within the loop toward and away Vfronithe other for en gagement with and release from the tube ends. m 'l'. A frame for mounting a discharge tube which comprises a substantially rigid wire' forming a longitudinal loop along the tube and transverse members associated with said loop adapted-to embrace respectively the ends of the tube so'as 15 to hold the'tube between them, at least one of the transverse members being-slidable on the sides of the loop and having thereon means to *engage said vloop for locking said member at any desired position on said loop.

il.. A frame for mounting a discharge ftube which comprisesa substantially rlgidwire forming a longitudinal loopY along the tube and transverse members associated with said loop Yadapted to embrace respectively the vends of the tube so as to hold the tube between them, at least one of the transverse members being anintegral part of the loop and having formed centrally thereofV a re-entrant loop adapted to receive-a relatively small part of the end of the tube and normally ao' closed therearound by lateral compression of the sides of the loop but adapted to open by resilient separation of said'sidesof the loop and thus to permit removal of the tube therefrom.

9. A frame for mounting a discharge tube which comprises a substantially rigid wire form-` ing a longitudinal loop along the tube and transverse members associated with said loop adapted `to embrace respectively'the ends of the tube so as to hold the tube between them, at least one Vof 40 said transverse members being movable within the loop toward andawayfrom the other for engagement with and release from the tube ends,

land in which the transverse member which is movable comprises a plate adapted to engage the 45 jacket .so thatwhen pulled longitudinally against the jacket it serves tol position the tube therein and the other transverse member comprises integral end of the loop bent inwardly near its center part toward said plate and resilient, whereby' when Vtension is put on the loop against adischarge tube the sides of the loop will be forced' outwardly against the sides of the jacket.

10.-In al lamp the combination'of an open 55 ended vitreous envelope having internal projections formed therein, a connector base iltted over the-open end of said envelope, and clamping means engaging said projections inside said envelope and also engaging said base to clamp a0V the base onto the open end ot the envelope and said clamping means being4 adjustable .and releasable from outside of the base. e

11. The combination as deilned in claim 10 in which the clamping meansengaging the projections is a resilient disk having notches "in its periphery'adapted when aligned with said projections to permit the disk to pass thereover and smaller notches spaced from the rst adapted in a diierent position of he disk'to receive'a part 70l only of said projections whereby to lock the disk against turning but being toc small to allow the disk to pass over theproiectlons.

. 12.,An electrical discharge lamp which come Prises a sealed envelope for the discharge, electrodes theefor, open ended jacket adapted to receive and protect the envelope, means for removably enga-sins the envelope and supporting it ln the jacket spaced from the walls thereof, ,a 5 connector base extended from the open end of tile jacket for connecting and supporting said lamp in a lamp jacket, a ring extended from said base over ther-lm of the jacket 4.whereby to close its open end between the tube and connector base, means adapted removably to connect the contact elements of the connector base to the electrodes and means adapted to engage the jacket and to pull the connector base inwardly toward its open end and thereby clamp said ring against the jacket, hold the parts in assembled relation, and support the lamp assembly from the connector base.

FRIEDERICH H. A. BRANDT. 

